Gearing advice please

PsychDoc

Member
Sep 8, 2019
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Gear ratio check

Am I doing this right (or close enough)
Engine to tav2 or equivalent to rear sprocket
Engine rpm range roughly 2000-5000 keeping it conservative
The TAV2 starts at a 1:3 and progressively goes to 1:1- drives a 10 or 12 tooth sprocket.
26” rear tire

So say I have a 50 tooth rear
So the trans engages at around 2000- to a 1:3- 10 tooth- to the 50tooth rear equals a 15:1 total and 10.35mph
Max speed 5000rpm trans is now 1:1 overall ratio 1:5 and I’m at 77+mph

(Note to self- larger rear sprocket)

I’m using this page- https://electricscooterparts.com/motor-jackshaft-wheel-gear-ratio.html
 

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PsychDoc

Member
Sep 8, 2019
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No- 77mph is neither desired nor reasonably possible. Just talking it through
 

Tony01

Well-Known Member
Nov 28, 2012
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sf bay area
nsr you can run the 5:1 but you’ll always be shifting. It does rev a bit during shifting but only maybe 1200rpm. Won’t blow but the ride is meh